Take a look at the citrus I left in someone care when I moved house. Aren't they lovely!! I have clearly taken them back. The last pic...that one was actually on its side next to the pot, blown out, so I put it in new potting mix and crossed my fingers.
A disaster! I would have swung her with her hair till she was dizzy. I know its a bit of a risk leaving with friends but you should go the extra mile on anothers behalf. I once looked after my sister's African Violet. It was in flower when she went and still in flower on her return..passed it back to her minute she arrived home in case the flower dropped off...hahahaha I was given strict instructions on how to, when it was last fed. Very pernicity plants. For anyone not knowing the Cystus plant here is the low down http://en.wikipedia.org/wiki/Cistaceae